CVE-2023-53363

Kernel compromise via freed PCI bus access

Published Sep 17, 2025 · Updated Sep 17, 2025

Use-after-free in Linux 6.2 through 6.2.11 and 6.3-rc1 through 6.3-rc6 allows local users to compromise the kernel via PCI root-bus removal. pci_remove_root_bus() calls pci_remove_bus(), which releases struct pci_bus, before pci_bus_release_domain_nr() reads that freed object. Reachability requires low-privileged local access and a PCI host teardown path; published scoring bounds the impact to kernel confidentiality, integrity, and availability.

CVSS severity7.8
High
EPSS probability0.19%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in Linux 6.2 through 6.2.11 and 6.3-rc1 through 6.3-rc6 allows local users to compromise the kernel via PCI root-bus removal. pci_remove_root_bus() calls pci_remove_bus(), which releases struct pci_bus, before pci_bus_release_domain_nr() reads that freed object. Reachability requires low-privileged local access and a PCI host teardown path; published scoring bounds the impact to kernel confidentiality, integrity, and availability.

The record

CVE
CVE-2023-53363
Published
Sep 17, 2025
Updated
Sep 17, 2025
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 17, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.2
  2. Affected versionversion=c14f7ccc9f5dcf9d06ddeec706f85405b2c80600 <07a75c0050e59c50f038cc5f4e2a3258c8f8c9d0
  3. Affected versionversion=c14f7ccc9f5dcf9d06ddeec706f85405b2c80600 <30ba2d09edb5ea857a1473ae3d820911347ada62
  4. Affected versionversion=db273126bf548a2dc611372e8f6a817b2b16b563 <ad367516b1c09317111255ecfbf5e42c33e31918
  5. Affected versionversion=ead4d69b3ef047b0f670511d81e9ced7ac876b44 <fbf45385e3419b8698b5e0a434847072375cfec2
  6. Affected versionversion=f8b6bd6c04d4dfc4c200e6fa306e61e3b42ec5fc <52b0343c7d628f37b38e3279ba585526b850ad3b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.2; version=c14f7ccc9f5dcf9d06ddeec706f85405b2c80600 <07a75c0050e59c50f038cc5f4e2a3258c8f8c9d0; version=c14f7ccc9f5dcf9d06ddeec706f85405b2c80600 <30ba2d09edb5ea857a1473ae3d820911347ada62; version=db273126bf548a2dc611372e8f6a817b2b16b563 <ad367516b1c09317111255ecfbf5e42c33e31918; version=ead4d69b3ef047b0f670511d81e9ced7ac876b44 <fbf45385e3419b8698b5e0a434847072375cfec2; version=f8b6bd6c04d4dfc4c200e6fa306e61e3b42ec5fc <52b0343c7d628f37b38e3279ba585526b850ad3b

Published CVSS scores

7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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